Hey, I've been a lurker.
The location where she pinged mostly struck me because it's near the airport. I suppose I wouldn't be surprised if she's missing by choice. Perhaps she met a new guy online or something. Maybe from the sugar daddy site or one of the shows she attended. Decided to leave her life behind and just go. She disabled her tracking, drove to the airport, parked, left her phone in the car and left. Hopefully there are people checking the airport lots or anywhere near there to see if she parked or someone left her car there
She seemed to like her lifestyle but also probably got pressured to grow up, go to school and stop living that way. I wasn't living her lifestyle but I still got that family pressure when I left university at around her age. It can be overwhelming and I certainly felt the urge to run a few times. It would be even easier for her to disappear because her job doesn't really require SSNs at lots of locations, it's more contract work.
There's the possibility that she met with foul play. Especially if she had a concert to attend soon and wanted a large quantity of drugs for it or something. I don't think she was an addict though, seemed to only use and drink in moderation rather than regularly(except pot).
I think scenario one is the most likely, honestly. I hope it's true and she's safe. Though KCMO PD seems to be a mess so I won't be surprised if they botch this investigation